Though state authorities had little use for the worldwide clemency bid whose backers included U.S. President Woodrow Wilson — powerless to intervene officially, since the execution was a state matter — Hill walked spryly into his martyrdom. The strange post-mortem career of his totemic ashes is the least of the ways Hill lives on.

His dauntless last message to fellow Wobbly Bill Haywood — “Don’t waste any time mourning. Organize.” — is a permanent fixture on pins and placards among every stripe of left activist. The songs he wrote remain in print — and in performance.

And the Depression-era tribute ballad “I Dreamed I Saw Joe Hill Last Night” can seamlessly serenade ripped-from-the-headlines footage, as a Paul Robeson rendition does in these clips of 1998 protests against then-New York City Mayor Rudy Giuliani.